Johnson Controls T-4002-5018 Dial

The Johnson Controls T-4002-5018 is a high-precision external set point dial engineered for integration with T-4000 Series pneumatic thermostats. This specific component is optimized for vertical mounted thermostats, providing a rugged, Fahrenheit scale interface (marking 55 to 85°F) for field adjustments without removing the protective instrument cover. This kit includes the dial, a pointer, and a captivated dial holding screw, ensuring a secure fit that resists vibration in industrial environments. Designed for 2-pipe high-volume output systems, it is the standard replacement for models including the T-4002-201, T-4002-202, and other high-volume single temperature thermostats. When installing, technicians should ensure the 20 PSIG supply pressure is stable to maintain factory calibration accuracy. This dial facilitates localized set point overrides, crucial for maintaining space temperature control and proportional output signals in commercial building automation systems (BAS). Its durable plastic construction and high-visibility markings make it a reliable choice for long-term HVAC maintenance and system retrofitting.

• Streamlined Calibration: External access allows for immediate set point adjustment without the need for cover removal, saving time during routine service calls.
• Universal Compatibility: Specifically designed to match the T-4000 series footprint, ensuring a drop-in fit for vertical mounting configurations.
• Secure Installation: Features a captivated holding screw that prevents loss of hardware during complex field repairs in tight spaces.
• Industrial Durability: Engineered to withstand the shock and vibration common in mechanical rooms and high-traffic commercial environments.

Is this dial compatible with horizontal thermostats?
No, the T-4002-5018 is specifically indexed for vertical mount orientations. Horizontal units require a dedicated horizontal scale dial to maintain correct visual alignment of the temperature set point.

Can I use this for 2-pipe low-volume output thermostats?
While it fits the physical T-4000 Series frame, it is primarily specified for high-volume output thermostats like the T-4002. Always verify the specific thermostat model number to ensure the pointer and cam align correctly with the internal sensing element.

How do I secure the dial?
The unit comes with a captivated screw already integrated into the dial. This eliminates the risk of dropping small components into the thermostat assembly or onto the floor during a pneumatic control repair.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.